Anomalous Magnetization Exponent and Singular Frustration Induced Gap in Incommensurate Massive One-Dimensional Lattice

This paper investigates the frustration induced phenomena at the commensurate-incommensurate crossing point in one-dimensional massive systems. The massive elementary excitation can be described by a dispersion e(k )=√∑ an cos(nk), with a set of phenomenological coefficients an, which depend on the frustration. From the dispersion,we find that at the commensurate-incommensurate crossing point, both pitch angle and the correlation length have square root singularities, being functions of funstration intensity. The gap in the incommensurate side also comes to be singular while approaching the crossing point. Anomalous magnetization exponent appears at the singular point of the spin gap.

作 者： GU Bo ZHANG Jun   作者單位： GU Bo(Department of Physics, Peking University, Beijing 100871, China)

ZHANG Jun(Department of Physics, Xinjiang University, Wurumqi 830046, China) 

刊 名： 理論物理通訊(英文版)  ISTIC SCI 英文刊名： COMMUNICATIONS IN THEORETICAL PHYSICS  年，卷(期)： 2004 42(7)  分類號：   關(guān)鍵詞： energy gap   incommensurate   one-dimensional system   magnetization